Add some travis config to try to avoid Capybara connection failures.
Add some travis config to try to avoid Capybara connection failures.

Per http://stackoverflow.com/questions/11448806/headless-gem-webkit-server-cannot-connect-to-x-server

KarmaHater/WikiEduDashboard,ragesoss/WikiEduDashboard,ragesoss/WikiEduDashboard,alpha721/WikiEduDashboard,sejalkhatri/WikiEduDashboard,sejalkhatri/WikiEduDashboard,thenickcox/WikiEduDashboard,majakomel/WikiEduDashboard,feelfreelinux/WikiEduDashboard,thenickcox/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,majakomel/WikiEduDashboard,Wowu/WikiEduDashboard,alpha721/WikiEduDashboard,majakomel/WikiEduDashboard,WinnySilva/WikiEduDashboard,MusikAnimal/WikiEduDashboard,adamwight/WikiEduDashboard,adamwight/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,KarmaHater/WikiEduDashboard,WinnySilva/WikiEduDashboard,majakomel/WikiEduDashboard,sejalkhatri/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,KarmaHater/WikiEduDashboard,Wowu/WikiEduDashboard,MusikAnimal/WikiEduDashboard,ragesoss/WikiEduDashboard,alpha721/WikiEduDashboard,MusikAnimal/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,KarmaHater/WikiEduDashboard,sejalkhatri/WikiEduDashboard,Wowu/WikiEduDashboard,sejalkhatri/WikiEduDashboard,alpha721/WikiEduDashboard,feelfreelinux/WikiEduDashboard,Wowu/WikiEduDashboard,feelfreelinux/WikiEduDashboard,WinnySilva/WikiEduDashboard,feelfreelinux/WikiEduDashboard,adamwight/WikiEduDashboard,thenickcox/WikiEduDashboard,MusikAnimal/WikiEduDashboard